PROBLEM TO BE SOLVED: To provide a magnetic material at a high practical value capable of adjusting the extremely high coercive force Hc of an [epsilon]-Fe2
crystal within a range capable of being used for the various magnetic applications of a magnetic recording medium or the like. ; SOLUTION: A magnetic pulverulent body has an ferrous-oxide phase equalizing the [epsilon]-Fe2
crystal and a space group, and having a crystal having a structure substituting Al for a part of the Fe site of the [epsilon]-Fe2
as a main phase. The magnetic pulverulent body satisfies 0
The inventors found that by substituting Al for some of the Fe sites of the -Fe2O3 described in References 1 to 3, coercive force can be controlled by controlling the amount of substitution, without substantially changing the space group of the crystal structure.
Thus, the invention provides a magnetic material having an iron oxide phase whose principal phase is a crystal of a structure which has the same space group as the -Fe2O3 crystal and in which Al is substituted for some of the Fe sites of the -Fe2O3 crystal, in which iron oxide phase the molar ratio of Al to Fe when expressed as Al : Fe = x : (2 - x) satisfies 0 < x < 1.
OGOSHI SHINICHI; SAKURAI SHUNSUKE; KUROKI SHIRO; SATO KIMITAKA; SASAKI SHINYA
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